Title :
Hierarchical Transmission Optimization for Massively Dense Distributed Antenna Systems
Author :
Wei Feng ; Ning Ge ; Jianhua Lu
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
In a massively dense distributed antenna system (md-DAS), forming user-centric virtual cells (VCs) is an effective way to reduce the implementation complexity. However, the general transmission scheme design for multiple interfering VCs still remains largely open. In this letter, we present an efficient coordinated beamforming scheme to solve this problem in a hierarchical manner, i.e., making different transmission parameters hierarchically adapt to the channel information with different accuracy. Particularly, the direction of the beams is designed by optimizing the achievable rate of each VC, and the strength of the beams is contrived via joint multi-VC interference coordination. Simulation results show that the proposed scheme, although may not be globally optimal, can provide a significant performance gain over the existing methods.
Keywords :
antenna arrays; array signal processing; optimisation; efficient coordinated beamforming scheme; general transmission scheme design; hierarchical transmission optimization; joint multi-VC interference coordination; massively dense distributed antenna systems; md-DAS; user-centric virtual cells; Antenna arrays; Array signal processing; Interference; Optimization; Transmitting antennas; Wireless communication; Distributed antenna system (DAS); coordinated beamforming; hierarchical optimization; irtual cell (VC); virtual cell (VC);
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2015.2401584